HB2018 - List of Keywords (DTL)

Paper	Title	Other Keywords	Page
MOP2WB01	60 mA Beam Study in J-PARC Linac	rfq, linac, lattice, simulation	60
	Y. Liu KEK/JAEA, Ibaraki-Ken, Japan A. Miura JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan T. Miyao KEK, Ibaraki, Japan M. Otani, T. Shibata J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Upgrade of Linac peak current from 50 mA to 60 mA is one of the keys to the next power upgrade in J-PARC. Beam studies with 60 mA were carried out in July and December, 2017, for the challenging issues such as investigation of beam property from the ion source, halo behavior throughout the LEBT, RFQ and MEBT1, emittance/Twiss measurement at MEBT1, beam emittance control, etc. Expected/unexpected problems, intermediate results and preparation for the next trials were introduced in this paper.
	Slides MOP2WB01 [12.952 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP2WB03	Emittance Growth and Beam Losses in LANSCE Linear Accelerator	emittance, beam-losses, proton, linac	70
	Y.K. Batygin, R.W. Garnett, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396. The LANSCE Accelerator facility currently utilizes four 800 MeV H⁻ beams and one 100 MeV proton beam. Multi-beam operation requires careful control of accelerator tune to minimize beam losses. The most powerful 80 kW H⁻ beam is accumulated in the Proton Storage Ring and is extracted to the Lujan Neutron Scattering Center facility for production of moderated neutrons with meV-keV energy. Another H⁻ beam is delivered to the Weapon Neutron Research facility to create un-moderated neutrons in the keV - MeV energy range. The third H⁻ beam is shared between the Proton Radiography Facility and the Ultra-Cold Neutron facility. The 23 kW proton beam is used for isotope production in the fields of medicine, nuclear physics, national security, environmental science and industry. Minimization of beam losses in the linac is achieved due to careful tuning of the beam in each section of the accelerator facility, imposing restrictions on amplitudes and phases of RF sections, control of H⁻ beam stripping, and optimization of ion sources operation. This paper summarizes experimental results in accelerator operations and categorizes various sources of emittance growth and beam losses.
	Slides MOP2WB03 [4.570 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA1WD01	ESS Commissioning Plans	MMI, linac, rfq, ion-source	127
	N. Milas, R. De Prisco, M. Eshraqi, Y. Levinsen, R. Miyamoto, M. Muñoz, D.C. Plostinar ESS, Lund, Sweden
	The ESS linac is currently under construction in Lund, Sweden, and once completed it will deliver an unprecedented 5 MW of average power. The ion source and LEBT commissioning starts in 2018 and will continue with the RFQ, MEBT and the first DTL tank next year and up to the end of the fourth DTL tank in 2020. This paper will summarize the commissioning plans for the normal conducting linac with focus on the ion source and LEBT and application development for both commissioning and operation.
	Slides TUA1WD01 [1.552 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA1WD01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA2WB02	Recent Studies of Beam Physics for Ion Linacs	emittance, injection, cavity, linac	200
	L. Groening, S. Appel, X. Du, P. Gerhard, M.T. Maier, A. Rubin, P. Scharrer, H. Vormann, C. Xiao GSI, Darmstadt, Germany M. Chung UNIST, Ulsan, Republic of Korea P. Scharrer HIM, Mainz, Germany P. Scharrer Mainz University, Mainz, Germany
	The UNIversal Linear ACcelerator (UNILAC) at GSI aims at provision of high brilliant ion beams, as it main purpose will be to serve as injector for the upcoming FAIR accelerator complex. The UNILAC injects into the subsequent synchrotron SIS18 applying horizontal multi-turn injection (MTI). Optimization of this process triggered intense theoretical and experimental studies of dynamics of transversely coupled beams. These activities comprise round-to-flat beam transformation, full 4d transverse beam diagnostics, optimization of the MTI parameters through generic algorithms, and extension of Busch's theorem to accelerated particle beams. Finally, recent advance in modeling time-transition-factors and its impact on improved linac performance will be presented as well as progress in the optimization of ion charge state stripping.
	Slides WEA2WB02 [4.772 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA2WB02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP2WB03	Influence of the Cavity Field Flatness and Effect of the Phase Reference Line Errors on the Beam Dynamics of the ESS Linac	cavity, linac, controls, LLRF	377
	R. De Prisco, R. Zeng ESS, Lund, Sweden K. Czuba, T.P. Leśniak, R. Papis, D. Sikora, M. Żukociński Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	The particle longitudinal dynamics is affected by errors on the phase and amplitude of the electro-magnetic field in each cavity that cause emittance growth, beam degradation and losses. One of the causes of the phase error is the change of the ambient temperature in the LINAC tunnel, in the stub and in the klystron gallery that induces a phase drift of the signal travelling through the cables and radio frequency components. The field flatness error of each multiple cell cavity is caused by volume perturbation, cell to cell coupling, tuner penetration, etc.. In this paper it is studied the influences of these two types of errors on the beam dynamics and it is determined their tolerances such that the beam quality is kept within acceptable limits.
	Slides THP2WB03 [1.556 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THP2WB03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOP2WB01

60 mA Beam Study in J-PARC Linac

rfq, linac, lattice, simulation

60

Y. Liu
KEK/JAEA, Ibaraki-Ken, Japan
A. Miura
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
T. Miyao
KEK, Ibaraki, Japan
M. Otani, T. Shibata
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Upgrade of Linac peak current from 50 mA to 60 mA is one of the keys to the next power upgrade in J-PARC. Beam studies with 60 mA were carried out in July and December, 2017, for the challenging issues such as investigation of beam property from the ion source, halo behavior throughout the LEBT, RFQ and MEBT1, emittance/Twiss measurement at MEBT1, beam emittance control, etc. Expected/unexpected problems, intermediate results and preparation for the next trials were introduced in this paper.

Slides MOP2WB01 [12.952 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP2WB03

Emittance Growth and Beam Losses in LANSCE Linear Accelerator

emittance, beam-losses, proton, linac

70

Y.K. Batygin, R.W. Garnett, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396.
The LANSCE Accelerator facility currently utilizes four 800 MeV H⁻ beams and one 100 MeV proton beam. Multi-beam operation requires careful control of accelerator tune to minimize beam losses. The most powerful 80 kW H⁻ beam is accumulated in the Proton Storage Ring and is extracted to the Lujan Neutron Scattering Center facility for production of moderated neutrons with meV-keV energy. Another H⁻ beam is delivered to the Weapon Neutron Research facility to create un-moderated neutrons in the keV - MeV energy range. The third H⁻ beam is shared between the Proton Radiography Facility and the Ultra-Cold Neutron facility. The 23 kW proton beam is used for isotope production in the fields of medicine, nuclear physics, national security, environmental science and industry. Minimization of beam losses in the linac is achieved due to careful tuning of the beam in each section of the accelerator facility, imposing restrictions on amplitudes and phases of RF sections, control of H⁻ beam stripping, and optimization of ion sources operation. This paper summarizes experimental results in accelerator operations and categorizes various sources of emittance growth and beam losses.

Slides MOP2WB03 [4.570 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOP2WB03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA1WD01

ESS Commissioning Plans

MMI, linac, rfq, ion-source

127

N. Milas, R. De Prisco, M. Eshraqi, Y. Levinsen, R. Miyamoto, M. Muñoz, D.C. Plostinar
ESS, Lund, Sweden

The ESS linac is currently under construction in Lund, Sweden, and once completed it will deliver an unprecedented 5 MW of average power. The ion source and LEBT commissioning starts in 2018 and will continue with the RFQ, MEBT and the first DTL tank next year and up to the end of the fourth DTL tank in 2020. This paper will summarize the commissioning plans for the normal conducting linac with focus on the ion source and LEBT and application development for both commissioning and operation.

Slides TUA1WD01 [1.552 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-TUA1WD01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA2WB02

Recent Studies of Beam Physics for Ion Linacs

emittance, injection, cavity, linac

200

L. Groening, S. Appel, X. Du, P. Gerhard, M.T. Maier, A. Rubin, P. Scharrer, H. Vormann, C. Xiao
GSI, Darmstadt, Germany
M. Chung
UNIST, Ulsan, Republic of Korea
P. Scharrer
HIM, Mainz, Germany
P. Scharrer
Mainz University, Mainz, Germany

The UNIversal Linear ACcelerator (UNILAC) at GSI aims at provision of high brilliant ion beams, as it main purpose will be to serve as injector for the upcoming FAIR accelerator complex. The UNILAC injects into the subsequent synchrotron SIS18 applying horizontal multi-turn injection (MTI). Optimization of this process triggered intense theoretical and experimental studies of dynamics of transversely coupled beams. These activities comprise round-to-flat beam transformation, full 4d transverse beam diagnostics, optimization of the MTI parameters through generic algorithms, and extension of Busch's theorem to accelerated particle beams. Finally, recent advance in modeling time-transition-factors and its impact on improved linac performance will be presented as well as progress in the optimization of ion charge state stripping.

Slides WEA2WB02 [4.772 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA2WB02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP2WB03

Influence of the Cavity Field Flatness and Effect of the Phase Reference Line Errors on the Beam Dynamics of the ESS Linac

cavity, linac, controls, LLRF

377

R. De Prisco, R. Zeng
ESS, Lund, Sweden
K. Czuba, T.P. Leśniak, R. Papis, D. Sikora, M. Żukociński
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

The particle longitudinal dynamics is affected by errors on the phase and amplitude of the electro-magnetic field in each cavity that cause emittance growth, beam degradation and losses. One of the causes of the phase error is the change of the ambient temperature in the LINAC tunnel, in the stub and in the klystron gallery that induces a phase drift of the signal travelling through the cables and radio frequency components. The field flatness error of each multiple cell cavity is caused by volume perturbation, cell to cell coupling, tuner penetration, etc.. In this paper it is studied the influences of these two types of errors on the beam dynamics and it is determined their tolerances such that the beam quality is kept within acceptable limits.

Slides THP2WB03 [1.556 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-THP2WB03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)